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Selection Guide (.pdf)
Here is another example of site specific shutdown. Seismically instrumented sites further away did not shutdown automatically, and did not experience any damage.

A broadcast alarm signal used for earthquake actuated automatic shutoff would have unnecessarily shutdown the processes at other facilities- at potentially significant cost to the owner depending upon the stage of work in progress, cost to scrap work in progress, line re-start costs, material re-work costs, etc.